﻿using System;
using System.Collections.Generic;
using System.Data.SQLite;
using System.Web;
using System.Data;
using System.Collections;

/// <summary>
///SqliteHelper 的摘要说明
/// </summary>
public class SqliteHelper
{
    public enum DbConnectionOwnership
    {
        /// <summary></summary>  
        /// 自动关闭  
        ///   
        Internal,
        /// <summary></summary>  
        /// 手动关闭  
        ///   
        External,
    }
    public SqliteHelper()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }
    public static string ConnectionString = "Data Source=" + System.Web.HttpContext.Current.Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["connstr"].ToString() + ";Version=3;");
    public static SQLiteConnection GetSQLiteConnection()
    {

        return new SQLiteConnection(ConnectionString);

    }





    #region 静态私有方法
    /// <summary></summary>  
    /// 附加参数  
    ///   
    /// <param name="command" />  
    /// <param name="commandParameters" />  
    private static void AttachParameters(SQLiteCommand command, SQLiteParameter[] commandParameters)
    {
        command.Parameters.Clear();
        foreach (SQLiteParameter p in commandParameters)
        {
            if (p.Direction == ParameterDirection.InputOutput && p.Value == null)
                p.Value = DBNull.Value;
            command.Parameters.Add(p);
        }
    }
    /// <summary></summary>  
    /// 分配参数值  
    ///   
    /// <param name="commandParameters" />  
    /// <param name="parameterValues" />  
    private static void AssignParameterValues(SQLiteParameter[] commandParameters, object[] parameterValues)
    {
        if (commandParameters == null || parameterValues == null)
            return;
        if (commandParameters.Length != parameterValues.Length)
            throw new ArgumentException("Parameter count does not match Parameter Value count.");
        for (int i = 0, j = commandParameters.Length; i < j; i++)
        {
            commandParameters[i].Value = parameterValues[i];
        }
    }
    /// <summary></summary>  
    /// 预备执行command命令  
    ///   
    /// <param name="command" />  
    /// <param name="connection" />  
    /// <param name="transaction" />  
    /// <param name="commandType" />  
    /// <param name="commandText" />  
    /// <param name="commandParameters" />  
    private static void PrepareCommand(SQLiteCommand command,
        SQLiteConnection connection, SQLiteTransaction transaction,
        CommandType commandType, string commandText, SQLiteParameter[] commandParameters
        )
    {
        if (commandType == CommandType.StoredProcedure)
        {
            throw new ArgumentException("SQLite 暂时不支持存储过程");
        }
        if (connection.State != ConnectionState.Open)
            connection.Open();
        command.Connection = connection;
        command.CommandText = commandText;
        if (transaction != null)
            command.Transaction = transaction;
        command.CommandType = commandType;
        if (commandParameters != null)
            AttachParameters(command, commandParameters);
        return;
    }
    #endregion

    #region ExecuteNonQuery 执行SQL命令，返回影响行数
    /// <summary></summary>  
    /// 执行SQL命名  
    ///   
    /// <param name="ConnectionString" />  
    /// <param name="commandType" />  
    /// <param name="commandText" />  
    /// <returns></returns>  
    public static int ExecuteNonQuery(string ConnectionString, CommandType commandType, string commandText)
    {
        return ExecuteNonQuery(ConnectionString, commandType, commandText, (SQLiteParameter[])null);
    }
    /// <summary></summary>  
    /// 不支持存储过程，但可以参数化查询  
    ///   
    /// <param name="ConnectionString" />  
    /// <param name="commandType" />  
    /// <param name="commandText" />  
    /// <param name="commandParameters" />  
    /// <returns></returns>  
    public static int ExecuteNonQuery(string ConnectionString, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
    {
        using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
        {
            conn.Open();
            return ExecuteNonQuery(conn, commandType, commandText, commandParameters);
        }
    }
    public static int ExecuteNonQuery(SQLiteConnection connection, CommandType commandType, string commandText)
    {
        return ExecuteNonQuery(connection, commandType, commandText, (SQLiteParameter[])null);
    }
    public static int ExecuteNonQuery(SQLiteConnection connection, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
    {
        SQLiteCommand cmd = new SQLiteCommand();
        PrepareCommand(cmd, connection, (SQLiteTransaction)null, commandType, commandText, commandParameters);
        int retval = cmd.ExecuteNonQuery();
        cmd.Parameters.Clear();
        return retval;
    }
    #endregion

    #region ExecuteDataSet 执行SQL查询，并将返回数据填充到DataSet
    public static DataSet ExecuteDataset(SQLiteConnection connection, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
    {
        SQLiteCommand cmd = new SQLiteCommand();
        PrepareCommand(cmd, connection, (SQLiteTransaction)null, commandType, commandText, commandParameters);
        SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        cmd.Parameters.Clear();
        return ds;
    }
    public static DataSet ExecuteDataset(SQLiteConnection connection, CommandType commandType, string commandText)
    {
        return ExecuteDataset(connection, commandType, commandText, (SQLiteParameter[])null);
    }
    public static DataSet ExecuteDataset(string ConnectionString, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
    {

        using (SQLiteConnection cn = new SQLiteConnection(ConnectionString))
        {
            cn.Open();

            return ExecuteDataset(cn, commandType, commandText, commandParameters);
        }
    }
    public static DataSet ExecuteDataset(string ConnectionString, CommandType commandType, string commandText)
    {
        return ExecuteDataset(ConnectionString, commandType, commandText, (SQLiteParameter[])null);
    }
    #endregion

    #region ExecuteReader 执行SQL查询,返回DbDataReader
    public static SQLiteDataReader ExecuteReader(SQLiteConnection connection, SQLiteTransaction transaction, CommandType commandType, string commandText, SQLiteParameter[] commandParameters, DbConnectionOwnership connectionOwnership)
    {
        SQLiteCommand cmd = new SQLiteCommand();
        PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);
        SQLiteDataReader dr;
        if (connectionOwnership == DbConnectionOwnership.External)
            dr = cmd.ExecuteReader();
        else
            dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        cmd.Parameters.Clear();
        return dr;
    }
    /// <summary></summary>  
    ///读取数据后将自动关闭连接  
    ///   
    /// <param name="ConnectionString" />  
    /// <param name="commandType" />  
    /// <param name="commandText" />  
    /// <param name="commandParameters" />  
    /// <returns></returns>  
    public static SQLiteDataReader ExecuteReader(string ConnectionString, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
    {
        SQLiteConnection cn = new SQLiteConnection(ConnectionString);
        cn.Open();
        try
        {
            return ExecuteReader(cn, null, commandType, commandText, commandParameters, DbConnectionOwnership.Internal);
        }
        catch
        {
            cn.Close();
            throw;
        }
    }
    /// <summary></summary>  
    /// 读取数据后将自动关闭连接  
    ///   
    /// <param name="ConnectionString" />  
    /// <param name="commandType" />  
    /// <param name="commandText" />  
    /// <returns></returns>  
    public static SQLiteDataReader ExecuteReader(string ConnectionString, CommandType commandType, string commandText)
    {
        return ExecuteReader(ConnectionString, commandType, commandText, (SQLiteParameter[])null);
    }
    /// <summary></summary>  
    /// 读取数据以后需要自行关闭连接  
    ///   
    /// <param name="connection" />  
    /// <param name="commandType" />  
    /// <param name="commandText" />  
    /// <returns></returns>  
    public static SQLiteDataReader ExecuteReader(SQLiteConnection connection, CommandType commandType, string commandText)
    {
        return ExecuteReader(connection, commandType, commandText, (SQLiteParameter[])null);
    }
    /// <summary></summary>  
    /// 读取数据以后需要自行关闭连接  
    ///   
    /// <param name="connection" />  
    /// <param name="commandType" />  
    /// <param name="commandText" />  
    /// <param name="commandParameters" />  
    /// <returns></returns>  
    public static SQLiteDataReader ExecuteReader(SQLiteConnection connection, CommandType commandType, string commandText, params SQLiteParameter[] commandParameters)
    {
        return ExecuteReader(connection, (SQLiteTransaction)null, commandType, commandText, commandParameters, DbConnectionOwnership.External);
    }
    #endregion



    #region 公用方法

    public static int GetMaxID(string FieldName, string TableName)
    {
        string strsql = "select max(" + FieldName + ")+1 from " + TableName;
        object obj = GetSingle(strsql);
        if (obj == null)
        {
            return 1;
        }
        else
        {
            return int.Parse(obj.ToString());
        }
    }
    public static bool Exists(string strSql)
    {
        object obj = GetSingle(strSql);
        int cmdresult;
        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
        {
            cmdresult = 0;
        }
        else
        {
            cmdresult = int.Parse(obj.ToString());
        }
        if (cmdresult == 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    public static bool Exists(string strSql, params SQLiteParameter[] cmdParms)
    {
        object obj = GetSingle(strSql, cmdParms);
        int cmdresult;
        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
        {
            cmdresult = 0;
        }
        else
        {
            cmdresult = int.Parse(obj.ToString());
        }
        if (cmdresult == 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }

    #endregion

    #region  执行简单SQL语句

    /// <summary>
    /// 执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SQLite.SQLiteException E)
                {
                    connection.Close();
                    throw new Exception(E.Message);
                }
            }
        }
    }

    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">多条SQL语句</param>		
    public static void ExecuteSqlTran(ArrayList SQLStringList)
    {
        using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
        {
            conn.Open();
            SQLiteCommand cmd = new SQLiteCommand();
            cmd.Connection = conn;
            SQLiteTransaction tx = conn.BeginTransaction();
            cmd.Transaction = tx;
            try
            {
                for (int n = 0; n < SQLStringList.Count; n++)
                {
                    string strsql = SQLStringList[n].ToString();
                    if (strsql.Trim().Length > 1)
                    {
                        cmd.CommandText = strsql;
                        cmd.ExecuteNonQuery();
                    }
                }
                tx.Commit();
            }
            catch (System.Data.SQLite.SQLiteException E)
            {
                tx.Rollback();
                throw new Exception(E.Message);
            }
        }
    }
    /// <summary>
    /// 执行带一个存储过程参数的的SQL语句。
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString, string content)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            SQLiteCommand cmd = new SQLiteCommand(SQLString, connection);
            SQLiteParameter myParameter = new SQLiteParameter("@content", DbType.String);
            myParameter.Value = content;
            cmd.Parameters.Add(myParameter);
            try
            {
                connection.Open();
                int rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (System.Data.SQLite.SQLiteException E)
            {
                throw new Exception(E.Message);
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }
    /// <summary>
    /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
    /// </summary>
    /// <param name="strSQL">SQL语句</param>
    /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
            SQLiteParameter myParameter = new SQLiteParameter("@fs", DbType.Binary);
            myParameter.Value = fs;
            cmd.Parameters.Add(myParameter);
            try
            {
                connection.Open();
                int rows = cmd.ExecuteNonQuery();
                return rows;
            }
            catch (System.Data.SQLite.SQLiteException E)
            {
                throw new Exception(E.Message);
            }
            finally
            {
                cmd.Dispose();
                connection.Close();
            }
        }
    }

    /// <summary>
    /// 执行一条计算查询结果语句，返回查询结果（object）。
    /// </summary>
    /// <param name="SQLString">计算查询结果语句</param>
    /// <returns>查询结果（object）</returns>
    public static object GetSingle(string SQLString)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (System.Data.SQLite.SQLiteException e)
                {
                    connection.Close();
                    throw new Exception(e.Message);
                }
            }
        }
    }
    /// <summary>
    /// 执行查询语句，返回SQLiteDataReader
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>SQLiteDataReader</returns>
    public static SQLiteDataReader ExecuteReader(string strSQL)
    {
        SQLiteConnection connection = new SQLiteConnection(ConnectionString);
        SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
        try
        {
            connection.Open();
            SQLiteDataReader myReader = cmd.ExecuteReader();
            return myReader;
        }
        catch (System.Data.SQLite.SQLiteException e)
        {
            throw new Exception(e.Message);
        }

    }
    /// <summary>
    /// 执行查询语句，返回DataSet
    /// </summary>
    /// <param name="SQLString">查询语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(string SQLString)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            DataSet ds = new DataSet();
            try
            {
                connection.Open();
                SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);
                command.Fill(ds, "ds");
            }
            catch (System.Data.SQLite.SQLiteException ex)
            {
                throw new Exception(ex.Message);
            }
            return ds;
        }
    }


    #endregion

    #region 执行带参数的SQL语句

    /// <summary>
    /// 执行SQL语句，返回影响的记录数
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString, params SQLiteParameter[] cmdParms)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            using (SQLiteCommand cmd = new SQLiteCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    int rows = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    return rows;
                }
                catch (System.Data.SQLite.SQLiteException E)
                {
                    throw new Exception(E.Message);
                }
            }
        }
    }
    public static int ExecuteInsert(string SQLString, params SQLiteParameter[] cmdParms)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            using (SQLiteCommand cmd = new SQLiteCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    int rows = int.Parse(cmd.ExecuteScalar().ToString());
                    cmd.Parameters.Clear();
                    return rows;
                }
                catch (System.Data.SQLite.SQLiteException E)
                {
                    throw new Exception(E.Message);
                }
            }
        }
    }


    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SQLiteParameter[]）</param>
    public static void ExecuteSqlTran(Hashtable SQLStringList)
    {
        using (SQLiteConnection conn = new SQLiteConnection(ConnectionString))
        {
            conn.Open();
            using (SQLiteTransaction trans = conn.BeginTransaction())
            {
                SQLiteCommand cmd = new SQLiteCommand();
                try
                {
                    //循环
                    foreach (DictionaryEntry myDE in SQLStringList)
                    {
                        string cmdText = myDE.Key.ToString();
                        SQLiteParameter[] cmdParms = (SQLiteParameter[])myDE.Value;
                        PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                        int val = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();

                        trans.Commit();
                    }
                }
                catch
                {
                    trans.Rollback();
                    throw;
                }
            }
        }
    }


    /// <summary>
    /// 执行一条计算查询结果语句，返回查询结果（object）。
    /// </summary>
    /// <param name="SQLString">计算查询结果语句</param>
    /// <returns>查询结果（object）</returns>
    public static object GetSingle(string SQLString, params SQLiteParameter[] cmdParms)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            using (SQLiteCommand cmd = new SQLiteCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    object obj = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (System.Data.SQLite.SQLiteException e)
                {
                    throw new Exception(e.Message);
                }
            }
        }
    }

    /// <summary>
    /// 执行查询语句，返回SQLiteDataReader
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>SQLiteDataReader</returns>
    public static SQLiteDataReader ExecuteReader(string SQLString, params SQLiteParameter[] cmdParms)
    {
        SQLiteConnection connection = new SQLiteConnection(ConnectionString);
        SQLiteCommand cmd = new SQLiteCommand();
        try
        {
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            SQLiteDataReader myReader = cmd.ExecuteReader();
            cmd.Parameters.Clear();
            return myReader;
        }
        catch (System.Data.SQLite.SQLiteException e)
        {
            throw new Exception(e.Message);
        }

    }

    /// <summary>
    /// 执行查询语句，返回DataSet
    /// </summary>
    /// <param name="SQLString">查询语句</param>
    /// <returns>DataSet</returns>
    public static DataSet Query(string SQLString, params SQLiteParameter[] cmdParms)
    {
        using (SQLiteConnection connection = new SQLiteConnection(ConnectionString))
        {
            SQLiteCommand cmd = new SQLiteCommand();
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            using (SQLiteDataAdapter da = new SQLiteDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
                try
                {
                    da.Fill(ds, "ds");
                    cmd.Parameters.Clear();
                }
                catch (System.Data.SQLite.SQLiteException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
    }


    private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, SQLiteTransaction trans, string cmdText, SQLiteParameter[] cmdParms)
    {
        if (conn.State != ConnectionState.Open)
            conn.Open();
        cmd.Connection = conn;
        cmd.CommandText = cmdText;
        if (trans != null)
            cmd.Transaction = trans;
        cmd.CommandType = CommandType.Text;//cmdType;
        if (cmdParms != null)
        {
            foreach (SQLiteParameter parm in cmdParms)
                cmd.Parameters.Add(parm);
        }
    }

    #endregion


}